Hi Paul,
0 deg, just fold two of the three blades and see if they are in track.
Max. collective, move one blade over the tail, so the possible forward slant of the skids does not affect the angle. Still, calibrate your pitch gauge to zero there (at the 0 deg collective position).
Cyclic, the same as with two blades.
Just make sure that the swash plate rotation is OK in the first place, then the blades will behave the same as on a two bladed head.
Kind regards
Eddi
Born to fly ...
forced to work.